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Finding the Fourth Proportional to 1,223.38, 1,686.40 and 960.94

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Solution

The fourth proportional to 1,223.38, 1,686.40 and 960.94 is: 1,324.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.38 : 1,686.40 = 960.94 : x
  2. Step 2: Convert to fraction form
    1,223.38/1,686.40 = 960.94/x
  3. Step 3: Cross multiply
    1,223.38x = 1,686.40 × 960.94
  4. Step 4: Simplify right side
    1,223.38x = 1,620,529.22
  5. Step 5: Solve for x
    x = 1,620,529.22/1,223.38
  6. Step 6: Final answer
    x = 1,324.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.